/*
   demo80.c
    Install user's timer ISR.
    Use NewClock() to instead of clock(),because TC 2.0 BC++ 3.1 's clock()
    has bug.

    Operation:
     (1)5DigitLed will show the time.
	position 1 :  day
		2,3: hour (0-23)
		4,5: minute(0-59)
     (2)Led will toggle ON/OFF every 0.5 second.
     (3)press 'q' to quit.
*/
#include<stdio.h>
#include<conio.h>
#include<dos.h>
#include<stdlib.h>
#include"..\lib\7188.h"

static unsigned long ClkTck=0L;

void interrupt Isr1C(void)
{
  ClkTck++;
}
unsigned long far *Vect=(unsigned long far *)0L;
unsigned long Old1C;
void install_1C(void)
{
   Old1C=Vect[0x1c];
   Vect[0x1c]=Isr1C;
}

void restore_1C(void)
{
   Vect[0x1c]=Old1C;
}

unsigned long NewClock(void)
{
  return ClkTck;
}

void  main()
{ int sec=0,min=0,hour=0;
  int day=0,mon,year;
  int quit=0,c;
  unsigned start,end;
  int ledmode=1;
  unsigned count=0,d0=0;

  install_1C(); /* install new ISR */
  InitLib();
  start=NewClock();  /* read current TimeTicks */
  LedOn();
  Show5DigitLed(1,0);
  Show5DigitLed(2,0);
  Show5DigitLed(3,0);
  Show5DigitLed(4,0);
  Show5DigitLed(5,0);
  while(!quit) {
     Delay(500);
     ledmode=!ledmode;
     if(ledmode) LedOn();
     else LedOff();

     end=NewClock();
     if((end-start)>=1092){ /* 18.2*60=1092 --> 1 minute */
	start+=1092;
	min++;
	if(min==60) {
	   min=0;
	   hour++;
	   if(hour==24){
	      hour=0;
	      day++;
	      Show5DigitLed(1,day%10);
	   }
	   Show5DigitLed(2,hour/10);
	   Show5DigitLed(3,hour%10);
	}
	Show5DigitLed(4,min/10);
	Show5DigitLed(5,min%10);
     }
     if(kbhit4())		   /* check user keyboard */
       {
       c=getch4();			       /* get user's key-in */
       if ((c=='q')|| (c=='Q')) quit=1;        /* return to ROM-DOS */
       }
    }
    restore_1C();    /* restore ISR vector */
}